Free Annual Percentage Yield (APY)

APY vs. APR

The Annual Percentage Rate (APR) reflects the simple interest rate over a year. However, if interest is paid out monthly or daily and added to the principal balance, the account earns "interest on the interest." The Annual Percentage Yield (APY) is the metric that accounts for this compounding effect, providing the true, effective annual return.

The Power of Compounding

The more frequently interest compounds, the higher the APY will be compared to the stated APR. For example, a 5.00% APR compounding daily results in a 5.13% APY. Over decades, this seemingly minor difference causes exponential divergence in total account value.

Evaluating Investments

When measuring the efficacy of high-yield savings accounts or dividend-reinvesting index funds, utilizing comprehensive ROI calculators that factor in compounding periods via the APY metric ensures accurate retirement forecasting.